DE102014215465A1 - Subscriber station for a bus system and method for broadband CAN communication - Google Patents

Abstract

There is provided a subscriber station (11; 12) for a bus system (1) and a method for broadband communication in a bus system (1). The subscriber station (11, 12) comprises a communication control device (111, 121) for generating or reading at least one message (3, 31, 32, 33, 31, 33) for / from at least one further subscriber station of the bus system (1), in which an exclusive, collision-free access of a subscriber station (11 to 19) to a bus line (10) of the bus system (1) is ensured, at least temporarily, wherein the communication control device (111; 121) is configured, channel state information according to one in the bus system (1) the subscriber station (11; 12) to establish a time order for transmission so that the subscriber station (11; 12) does not have to transmit the channel status information in each message (3; 31,32; 33; 31,33) and wherein the Channel state information Information for determining the channel characteristic between the subscriber station (11, 12) and the further subscriber station (12 to 19, 11, 13 to 19) of the bus system (1), to wel the message (3; 31, 32; 33; 31, 33) is to be sent.

Description

Technical area

The present invention relates to a subscriber station for a bus system and a method for broadband CAN communication, in which a communication in a CAN bus system for higher speeds beyond CAN-FD is possible and in which the time required for determining the channel state information is shortened.

State of the art

The CAN bus system has gained wide acceptance for communication between sensors and ECUs. For example, it is used in automobiles. In the CAN bus system messages are transmitted by means of the CAN protocol, as described in the CAN specification in the ISO11898 is described. In particular, automotive bus systems are continually evolving toward higher bandwidth, lower latency, and more rigorous real-time capability. More recently, techniques have been proposed for this, such as CAN-FD, in which messages according to the specification "CAN with Flexible Data Rate, Specification Version 1.0" (source http://www.semiconductors.bosch.de) are transmitted, etc In such techniques, the maximum possible data rate is increased beyond a value of 1 Mbit / s by using a higher clock rate in the area of the data fields.

The extension of the CAN standard has been supplemented by primarily functional supplements, such as TTCAN, recently with CAN-FD especially with regard to the possible (higher) data rate and the usable data packet size extended, the original CAN properties were obtained especially in the form of arbitration. Furthermore, the signal representation in the data part was essentially changed by a higher switching frequency of the signal states (high / low = high / low).

The DE 10 2009 026 961 A1 refers to a method for transferring data between subscriber stations of a bus system. Here, an extension of the existing CAN signal and the associated communication device is described with regard to the use of high-frequency signals, which is stamped in arbitrary form, for example parallel in time or embedded, to a CAN data stream on the bus line. Here, a vote of the signal, be it synchronization signal, trigger signal, proposed with the CAN signal.

In order to further develop the CAN bus system at higher speeds beyond CAN-FD, there are concepts for the corresponding design and implementation of the physical layer. For this purpose, in a CAN-based communication, the transmitted information is received on a communication bus from several receivers at the same time, which are generally connected to the line at different points of the communication bus.

When using high-rate communication, such as in the middle frame part of a CAN frame, ie between the frame head and frame end, distortions in the form of e.g. Intersymbol interference (ISI) in the received signal.

For a robust reception, a receiver needs information about the channel status in the form of current impulse response and the present disturbance variables. These quantities generally depend on the current transceiver pairing, so that e.g. the impulse response on each receive path (different transmitters) must be known for a receiver, so that the message can be robustly detected by the use of equalization in the sense of sufficiently error-free. For N subscribers TN in the network i.A. N · (N - 1) / 2 different impulse responses. This is due to the fact that every connection between two subscribers TN has an i.A. has different impulse response, which at a time direction independent, so for transmitter TN 1 -> receiver TN 2 and transmitter TN 2 -> receiver TN 1, the same shape has (reciprocity).

Usually the required channel characterization quantities, in particular the channel impulse responses, are not initially known and present on the side of each receiver. Therefore, these, u.a. due to temperature effects, be re-estimated or adjusted at regular intervals. For estimation, a participant sends e.g. a known on all sides training sequence from the received signal, the corresponding channel impulse response can be estimated. This can be done simultaneously at several receiving sites, so that in general the transmission of N (orthogonal) sequences is sufficient to characterize the entire network.

It is conceivable, for example, to accommodate the training sequence in the frame header of the CAN frame. The problem with this, however, is that the transmission of the training sequence requires approximately, 5-25% of the time duration of a CAN frame. As a result, the net data rate of the overall system compared to the gross data rate decreases accordingly, as for the transmission of the training sequence used time can not be used for data transmission. This problem is especially blatant in systems with few subscribers or subscriber stations.

Disclosure of the invention

It is therefore an object of the present invention to provide a subscriber station for a bus system and a method which solve the aforementioned problems. In particular, a subscriber station for a bus system and a method are to be provided which enable a further development of the CAN signal structures and necessary communication devices to higher data rates and minimize the time required for determining the channel state information.

The object is achieved by a subscriber station for a bus system with the features of claim 1. The subscriber station comprises a communication control device for generating or reading at least one message for / from at least one further subscriber station of the bus system, in which at least temporarily an exclusive, collision-free access of a subscriber station to a bus line of the bus system is ensured, wherein the communication control device is configured, channel state information according to a time sequence established in the bus system for the subscriber station for transmission so that the subscriber station does not have to transmit the channel state information in each message, the channel state information comprising information for determining the channel characteristic between the subscriber station and the further subscriber station of the bus system to which the message is to be sent.

With the subscriber station a use of novel communication formats in the middle segment of the CAN frame is possible and also minimizes the time required to determine the channel state information.

Particularly in a network with only a few subscriber stations or subscribers, the time required to estimate the channel impulse responses is significantly shortened with the method performed by the subscriber station. In particular, the transmission of the training sequences can be transmitted depending on the participant and no longer message-dependent.

In addition, with the subscriber station, the CAN bus system has been further developed for higher speeds beyond CAN-FD so that essential application features are in line with existing CAN principles. As a result, a mixed operation is possible, in which the subscriber stations designed for the higher speeds are operated in mixed networks with existing CAN subscriber stations or CAN nodes.

The subscriber station described above is also suitable for use in systems which can process data rates beyond CAN-FD, as required.

Advantageous further embodiments of the subscriber station are specified in the dependent claims.

It is conceivable that the predetermined time sequence is a predetermined cycle time after which the communication control device is configured to transmit the channel state information, and the length of the predetermined cycle time is selected such that all the subscriber stations of the bus system have once sent the channel state information within the predetermined cycle time may be, or wherein the fixed time order in addition to the predetermined cycle time comprises that at least one subscriber station of the bus system for sporadically transmitting the channel state information is configured.

Possibly, the communication control device is also designed to generate the training sequence within the predetermined cycle time in order to realize that once a training sequence is sent out as a separate frame within this predetermined cycle time for all subscriber stations of the bus system.

In addition, the communication control device is preferably designed for the subscriber station-dependent transmission of the channel state information, and / or it is possible for the channel state information to be contained in a training sequence of the message.

The subscriber station described above may also include memory means for storing the channel state information when the message comprises the channel state information.

The communication controller may also be configured to determine whether the read message comprises the channel state information, wherein memory means is configured to store the channel state information when the communication controller determines that the read message comprises the channel state information.

Optionally, it is also conceivable that the subscriber station described above also has a correction device for correcting the message read based on the channel state information, wherein the correction device is configured to procure the channel state information from a training sequence of the message or from a memory device, if the message does not include a training sequence ,

According to one embodiment, it is possible that the message next to a frame header and a frame end has only the training sequence as a data part, or in another embodiment, that the training sequence is embedded in a data frame as a message.

The subscriber station described above may be part of a bus system, which also comprises a parallel bus line and at least two subscriber stations, which are connected to one another via the bus line so that they can communicate with each other. In this case, at least one of the at least two subscriber stations is a subscriber station described above.

The aforementioned object is also achieved by a method for broadband communication in a bus system according to claim 10. The method comprises the steps of: generating or reading, with a communication control device, at least one message for / from at least one further subscriber station of the bus system, in which an exclusive, collision-free access of a subscriber station to a bus line of the bus system is ensured at least temporarily, wherein the Communication control means for generating channel state information according to a time order for the subscriber station fixed in the bus system so that the subscriber station does not have to transmit the channel state information in each message, and the channel state information comprises information for determining the channel characteristic between the subscriber station and the other subscriber station of the bus system, to which the message is to be sent.

The method offers the same advantages as previously mentioned with respect to the subscriber station.

Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments described above or below with regard to the exemplary embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the invention.

drawings

The invention is described in more detail below with reference to the accompanying drawings and to exemplary embodiments. Show it:

1 a simplified block diagram of a bus system according to a first embodiment;

2 a schematic representation of the structure of a message in a bus system according to the first embodiment;

3 a matrix for schematically illustrating the diversity of the channel impulse responses in the bus system according to the first embodiment;

4 a simplified block diagram of a subscriber station of the bus system according to the first embodiment;

5 a timing diagram illustrating a transmission of messages of the individual subscriber stations over time in the bus system according to the first embodiment;

6 a timing diagram illustrating a transmission of messages of the individual subscriber stations over time in the bus system according to a second embodiment;

7 a schematic representation of the structure of a message in a bus system according to the second embodiment; and

8th a simplified block diagram of a subscriber station of the bus system according to the second embodiment;

9 a simplified block diagram of a subscriber station of the bus system according to the second embodiment.

In the figures, identical or functionally identical elements are provided with the same reference numerals, unless stated otherwise.

Description of the embodiments

1 shows a bus system 1 , which may be, for example, a CAN bus system, a CAN FD bus system, etc. The bus system 1 can be used in a vehicle, in particular a motor vehicle, an aircraft, etc., or in the hospital, etc.

In 1 has the bus system 1 a parallel bus with a bus line 10 , To the bus line 10 are in the present embodiment, nine participants in the form of subscriber stations 11 to 19 connected. However, it is also possible that the bus system 1 more, for example twelve (?), or less, for example five, participants. Over the bus line 10 can news 3 in the form of signals between the individual subscriber stations 11 to 19 be transmitted. The subscriber stations 11 to 19 may be, for example, control devices, sensors, display devices, etc. of a motor vehicle.

According to 2 have the news 3 one frame head each 3-1 , a data part 3-2 and a frame end 3-3 ,

3 shows the channel impulse responses h (t) of the parallel bus from 1 as an example for the subscriber stations 11 to 15 as a participant of the bus system 1 , As in 3 1, each channel impulse response h (t) depends on the transceiver pairing. Consequently, the channel impulse response is h (t) in the case where the subscriber station 11 Sender is and the subscriber station 12 Receiver usually different than in the case where the subscriber station 11 Sender is and the subscriber station 13 Receiver. The same applies to the other transmitter-receiver pairings.

For this reason, the subscriber stations 11 to 19 constructed as in 4 based on the subscriber station 11 as an example.

According to 4 has the subscriber station 11 a communication control device 111 , a storage device 112 , a correction device 113 and a transceiver 114 , The communication control device 111 has a data frame maker 1111 to create a single message as a data frame 31 in the form of a signal for the bus line 10 and a training sequencer 1112 to create a single training sequence 32 in the form of a signal for the bus line 10 on.

The data frame 31 and the training sequence 32 are each as separate messages 3 created on the bus line 10 to be transferred. At least the data frame 31 has next frame header and frame end of a common message 3 a data field that has a high-speed data format to transmit data according to the specification for CAN-FD or at an even higher data transfer rate. The data frame 31 includes only data intended for the operation of the addressed user station, but having no information from which to derive channel state information. In contrast, the training sequence includes 32 next to the frame header and end of a standard message 3 no such data as in the data frame 31 are included. The training sequence 32 So only includes data or information from which the channel state information can be derived, but no data, which are intended for the other operation of the addressed subscriber station.

In the storage device 112 can the training sequences 32 and / or the channel state information contained therein is stored, which the subscriber station 11 already from one of the other subscriber stations 12 to 19 has received and / or which the subscriber station 11 already created himself. The correction device 113 may be one of the transceiver 114 received signal using the training sequence 32 equalize and thus correct. The transmitting / receiving device 114 is directly to the bus line 10 connected, even if this is in 4 not shown.

The communication control device 111 serves to control a communication of the subscriber station 11 over the bus line 10 with another subscriber station to the bus line 10 connected subscriber stations 12 to 19 , The data frame builder 1111 , the training sequencer 1112 , the storage device 112 and the correction device 113 serve to transmit the messages 3 with high data rate on the bus line 10 with CAN bus topology, as described in more detail later. The communication control device 111 otherwise, it may be implemented like a conventional CAN controller. The transmitting / receiving device 114 can be implemented like a conventional CAN transceiver with regard to its transmitting and receiving functionality, except for the functions described below.

The subscriber stations 12 to 19 are constructed in the same manner as the subscriber station in the present embodiment 11 , Therefore, with the subscriber stations 11 to 19 a formation and then transmission of messages 3 can also be realized with higher data rates than CAN-FD, even with the small number of participants in the bus system 1 a better or better net data rate than in a transmission according to the CAN protocol is achieved.

For the estimation of the channel impulse response h (t) according to 3 sends, for example, the subscriber station 11 one from the training sequencer 1112 created training sequence 32 to all subscriber stations 12 to 19 , From the received signal of the training sequence 32 may be the receiving subscriber station of the subscriber stations 12 to 19 the corresponding Channel state information, such as the channel impulse response h (t), in particular by means of the communication control device 111 determine or estimate, and then in the storage device 112 to save. This can be done simultaneously at several receiving stations and thus subscriber stations of the subscriber stations 12 to 19 so that in general, the transmission of N (orthogonal) training sequences 32 for the characterization of the entire bus system 1 sufficient.

According to the present embodiment, the channel state information, in particular the channel impulse response h (t), does not become with every CAN message 3 redetermined. This is possible because the channel properties and thus the channel states change only slowly. Accordingly, in the present embodiment, those in a training sequence 32 contained channel state information from a previous message 3 , especially training sequence 32 , reused. This is done on the storage device 112 in which the previous received training sequences 32 and / or the channel state information determined therefrom, in particular the channel impulse response h (t), are stored. In each case, the information to which the respective subscriber station of the subscriber stations is stored is stored 11 to 19 is interested. This allows the time capacity of the bus system 1 by waiving renewed transmission of a training sequence 32 be saved.

According to 5 Therefore, in the present embodiment of the individual subscriber stations 11 to 19 regular training sequences 32 sent out. In 5 is the temporal transmission order of the training sequences 32 and the data frame 31 for the subscriber stations 11 . 12 . 13 ... N shown as an example. Thus, with regularly recurring time intervals, ie cyclically, training sequences 32 all subscriber stations 11 to 19 in the form of separate frames or messages 3 sent out. The transmission of data frames 31 takes place independently of the information of the associated training sequence 32 , As a result, the transmission of the data frames takes place 31 without additional information in the frame included in the training sequence 32 are included. The sum representation Σ in 5 shows the total allocation of the parallel bus on the bus line 10 of the bus system 1 ,

Especially in a network with only a few participants or subscriber stations as in the bus system 1 This method significantly reduces the time required to estimate the channel impulse responses h (t) and thus increases the net data rate of the overall system.

Another advantage is that in the present embodiment, the transmission of the training sequences 32 Participant-dependent and no longer message-dependent can be transmitted.

6 shows a traffic in a bus system 1 according to a second embodiment. Here, to ensure current channel state information at any time in each receiver, sporadically sending supplemented data frames 33 executed, one to a training sequence 332 supplemented data frame 33 have, as in 7 illustrated. The training sequence 332 can do this after a frame header 331 and in front of a data part 333 be inserted or anywhere in the data part 333 of the data frame 31 be inserted. The data part 333 follows a frame end 334 ,

As in 6 Sporadic sending of supplemented data frames can be shown 33 by a subscriber station, for example the subscriber station 12 by cyclically sending a separate training sequence 32 and separate data frame 31 through the other subscriber stations 11 and 13 be supplemented to N. However, here too, the subscriber station 12 the channel state information is not in every message 3 to send. Therefore, the subscriber station 12 if already before a predetermined time a supplemented data frame 33 as a message 3 was sent, next only again a data frame 31 , ie data without training sequence 332 send out.

Thus, in the present embodiment, the necessary training sequence 32 eg cyclically transmitted via dedicated CAN frames, as for the subscriber stations 11 and 13 to N shown. In contrast, however, is from the subscriber station 12 the necessary training sequence 332 Sporadically as an optional supplement to a CAN frame or supplemented data frame 33 inserted. The supplementation thus takes place as needed, which in particular is not cyclical. This is done, for example, via an identifier (flag) in the CAN frame header 331 a corresponding announcement to the receiving subscriber station of the subscriber stations 11 and 13 given to N. The sum representation Σ in 6 shows the total allocation of the parallel bus of the bus system 1 ,

The training sequence 332 according to 7 So is not a separate message in the present embodiment 3 with its own frame header and frame end but contains only the information needed to determine the channel state information from the data portion of the training sequence 32 according to the first embodiment. Again, at least the data field has 331 , but possibly also the training sequence 332 , a high-speed data format to transmit data according to the specification for CAN-FD or with an even higher data transfer rate. Also has the training sequence 332 a high-rate data format, the net data rate in the bus system can be further increased.

8th shows the consequent structure of the subscriber station 12 , The subscriber station 12 has a communication control device 121 , a storage device 122 , a correction device 123 and a transceiver 124 , The communication control device 121 has a data frame maker 1211 to create a single message 3 as a supplemented data frame 33 in the form of a signal for the bus line 10 on. In the data frame 33 is one of the training sequencer 1212 created training sequence 332 embedded, as previously described.

Otherwise, the bus system according to the present embodiment is constructed like the bus system 1 according to the first embodiment.

Thus, in the present embodiment, the subscriber stations transmit 11 and 13 to N cyclic training sequences 32 in the form of separate frames, whereas the subscriber station 12 a sporadic training sequence into a CAN frame, the supplemented data frame 33 , embeds.

Also, the configuration according to the present embodiment is in a network with only a few subscribers as in the bus system 1 According to the first embodiment advantageous because even the time required for the estimation of the channel impulse responses h (t) is significantly shortened by the present method. Again, the transmission of the training sequences 32 at least for the subscriber stations 11 and 13 to N, but also for the subscriber station 12 , subscriber-dependent and no longer message-dependent.

According to 9 can the subscriber station 12 in a third embodiment, either a sporadic training sequence in a frame 33 embedding, as described in the second embodiment, or sporadically individual training sequences 32 and individual data frames 31 as a separate frame, as described in the first embodiment. Otherwise, the bus system according to the present embodiment is constructed like the bus system 1 according to the first embodiment.

As a result, in the present embodiment, as in the first embodiment, the transmission of the training sequences 32 . 332 for all subscriber stations 11 up to N are transmitted depending on the subscriber and not message-dependent.

All previously described embodiments of the bus system 1 , the subscriber stations 11 to 19 and the method can be used individually or in all possible combinations. In particular, all the features of the embodiments described above can be combined as desired. In addition, the following modifications are conceivable, in particular.

The bus system described above 1 according to the embodiments is described based on a based on the CAN protocol bus system. The bus system 1 However, according to the embodiments may also be another type of communication network. It is advantageous, but not necessarily a requirement, that in the bus system 1 at least for certain periods of time an exclusive, collision-free access of a subscriber station 11 to 19 is guaranteed on a common channel.

The bus system 1 According to the embodiments is in particular a CAN network or a TTCAN network or a CAN FD network.

The cyclical transmission of training sequences 32 can be done in a blocked form, so that all subscriber stations 11 to 19 Your training sequences 32 , in corresponding frames, temporally coordinated in a fixed scheme, in particular synchronously, but staggered, send.

Each participant stations 11 to 19 can their messages 3 also asynchronous to other subscriber station (s) of the subscriber stations 11 to 19 and set the time according to your own scheme, eg via timer with timeout function (timeout function).

The use of cyclic and sporadic (or embedded in the CAN frame) training sequences 32 . 332 can be defined depending on the subscriber or subscriber station, so that an optimization of the transmission efficiency, in particular in the sense of the lowest possible overhead share, by the frame header 3-1 . 331 and frame end 3-3 . 334 arises, is achieved.

The training sequences 32 . 332 can be optimized mathematically for the determination of the channel state information or channel impulse response, especially with regard to the length of the sequence used 32 . 332 , Alternatively, known Sequences such as pseudo-noise, gold codes, Walsh codes, Kasami codes, Barker codes, etc. are used.

For sending separate or dedicated frames as training sequences 32 that do not include any further data contents may be prioritized in the bus system 1 certain priorities are assigned. Among other things, the priority should be a training sequence 32 higher than the priority of all from a subscriber station 11 to 19 sent messages 3 to get voted.

The training sequences 32 . 332 In addition to determining the channel impulse response h (t), they can also be used to determine disturbance variables. In particular, the signal-to-noise ratio (SNR) can be determined here. From this, a receiver can detect whether there may be a noise level at which a reception can no longer be guaranteed.

By regularly monitoring channel characteristics based on channel impulse responses h (t), this can be used to detect changes in the network characteristics of the bus system 1 be used. In particular, an unauthorized intervention on the network of the bus system 1 eg by switching on additional subscriber stations of the subscriber stations 11 to 19 be detected.

Use of bidirectional channel impulse responses h (t) may be used to generate keys for encrypting messages providing confidentiality protection on both sides. For example, consider the two subscriber stations 14 . 15 which want to communicate encrypted with each other, so after one cycle, the current channel impulse response h (t) at both subscriber stations 14 . 15 in front. The current channel impulse response h (t) can be used to generate a key (Physical Key Generation), which is otherwise unknown to any other subscriber station, since the other subscriber stations see other channel impulse responses h (t).

The number and arrangement of subscriber stations 11 to 19 in the bus system 1 The embodiments is arbitrary. In particular, only subscriber stations can 11 or subscriber stations 12 etc. in the bus system 1 the embodiments may be present.

The partitioning of the previously described functionality of the data frame creator 1111 and the training sequencer 1112 in a communication device 11 can also be realized such that the functionality described above is distributed over several blocks. As a result, as similar a design as possible in accordance with previous CAN controllers and CAN transceivers can be sought. Analog and digital interfaces can be used to connect several modules.

The subscriber stations 11 to 19 Especially for CAN-FD and systems with higher data rates, this represents a possibility to raise the reception quality of CAN-FD and of these systems to the range of usual CAN transmissions when using a much higher data rate.

That in the subscriber stations 11 to 19 executed method can be, for example, in a transceiver or a transceiver 114 in a communication control device 111 , etc. implement. Additionally or alternatively, it can be integrated into existing products.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009026961 A1 [0004]

Cited non-patent literature

• ISO11898 [0002]

Claims (10)

Subscriber station ( 11 ; 12 ) for a bus system ( 1 ), with a communication control device ( 111 ; 121 ) for creating or reading at least one message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) for / from at least one other subscriber station of the bus system ( 1 ), in which at least temporarily an exclusive, collision-free access of a subscriber station ( 11 to 19 ) on a bus line ( 10 ) of the bus system ( 1 ), the communication control device ( 111 ; 121 ), channel state information according to one in the bus system ( 1 ) for the subscriber station ( 11 ; 12 ) to create a timed order for transmission, so that the subscriber station ( 11 ; 12 ) the channel state information is not in every message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ), the channel state information containing information for determining the channel characteristic between the subscriber station ( 11 ; 12 ) and the further subscriber station ( 12 to 19 ; 11 . 13 to 19 ) of the bus system ( 1 ) to which the message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) is to be sent. Subscriber station ( 11 ; 12 ) according to claim 1, wherein the predetermined time sequence is a predetermined cycle time (T _Z ), after which the communication control device ( 111 ) is adapted to transmit the channel state information, and the length of the predetermined cycle time (T _Z ) is selected such that within the predetermined cycle time (T _Z ) all subscriber stations ( 11 to 19 ) of the bus system ( 1 ) may have once sent the channel state information, or wherein the fixed time sequence comprises, in addition to the predetermined cycle time (T _Z ), at least one subscriber station ( 12 ) of the bus system ( 1 ) is configured for sporadically transmitting the channel state information. Subscriber station ( 11 ; 12 ) according to claim 2, wherein the communication control device ( 111 ) is also designed to create the training sequence ( 32 ; 332 ) within the predetermined cycle time (T _Z ) to realize that within this predetermined cycle time (T _Z ) for all subscriber stations (T) 11 to 19 ) of the bus system ( 1 ) once a training sequence ( 32 ; 332 ) is sent out as a separate frame. Subscriber station ( 11 ; 12 ) according to one of the preceding claims, wherein the communication control device ( 111 ; 111 . 112 ) is also configured for the subscriber station-dependent transmission of the channel state information, and / or wherein the channel state information in a training sequence ( 32 ; 332 ) of the message ( 3 ; 32 ; 33 ) are included. Subscriber station ( 11 ; 12 ) according to one of the preceding claims, further comprising a memory device ( 112 ) for storing the channel state information when the message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) comprises the channel state information. Subscriber station ( 11 ; 12 ) according to one of the preceding claims, wherein the communication control device ( 111 ) is configured to determine whether the message read ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) has the channel state information, and wherein a memory device ( 112 ) is configured to store the channel state information when the communication control device ( 111 ) determines that the message read ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) has the channel state information Subscriber station ( 11 ; 12 ) according to claim 6, further comprising a correction device ( 113 ) to correct the message read ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) based on the channel state information, the correction device ( 113 ) is configured, the channel state information from a training sequence ( 32 ; 332 ) of the message ( 3 ; 33 ) or from a storage device ( 112 ), when the message ( 3 ; 33 ) no training sequence ( 32 ; 332 ). Subscriber station ( 11 ) according to any one of the preceding claims, wherein the message ( 3 ) next to a frame head ( 3-1 ) and a frame end ( 3-3 ) only the training sequence ( 32 ) as a data part ( 3-2 ), or wherein the training sequence ( 332 ) into a data frame ( 33 ) as message ( 3 ) is embedded. Bus system ( 1 ), with a parallel bus line ( 10 ), and at least two subscriber stations ( 11 to 19 ), which via the bus line ( 10 ) are interconnected such that they can communicate with each other, wherein at least one of the at least two subscriber stations ( 11 to 19 ) a subscriber station ( 11 ; 12 ) according to one of the preceding claims. Method for broadband communication in a bus system ( 1 ), comprising the steps of: creating or reading, with a communication control device ( 111 ; 121 ), at least one message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) for / from at least one other subscriber station of the bus system ( 1 ), in which at least temporarily an exclusive, collision-free access of a subscriber station ( 11 to 19 ) on a bus line ( 10 ) of the bus system ( 1 ), the communication control device ( 111 ; 121 ) Channel state information according to one in the bus system ( 1 ) for the subscriber station ( 11 ; 12 ) is created for transmission, so that the subscriber station ( 11 ; 12 ) the channel state information is not in every message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ), and wherein the channel state information comprises information for determining the channel characteristic between the subscriber station ( 11 ; 12 ) and the further subscriber station ( 12 to 19 ; 11 . 13 to 19 ) of the bus system ( 1 ) to which the message ( 3 ; 31 . 32 ; 33 ; 31 . 33 ) is to be sent.

Images